<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
</head>
<body>
<script>
    var c = 1
    function c(c){
        console.log(c)
        // var c=2
    }
    c(3) //c is not a function
</script>

</body>
</html>